Python __init__.py和类

在__init__.py文件中定义类是否被认为是不好的做法？我有一个类似于税收计算器的案例.我想要一个计算器类,然后是一组计算器类在内部引用的特定于州的税计算器类.就像是：

class TaxCalculator():

    def __init__(self):
        self.ca_tax_calculator = CATaxCalculator()
        self.ny_tax_calculator = NYTaxCalculator()

    def get_tax_calculator_for_state(self,state):
        tax_calculator = None
        if state == "CA":
            tax_calculator = self.ca_tax_calculator
        else:
            tax_calculator = self.ny_tax_calculator
        return tax_calculator

    def calculate(self,purchase_info):
        return self.get_tax_calculator_for_state(purchase_info.state).calculate(purchase_info.amount)

我正在考虑的目录结构如下所示：

/calculators/__init__.py
/calculators/ca.py
/calculators/ny.py

并且__init__.py包含了“TaxCalculator”功能.

课程将参考计算器,即：

from calculators import TaxCalculator

calculator = TaxCalculator().calculate(purchase_info)

这被认为是不好的做法还是没有真正的Pythonic？